S6805-56HF-G SSH登录问题

 H3C Comware Software, Version 7.1.070, Release 8307P62
display local-user  看到两个账户

Device management user openstackadmin:

  State:                      Active

  Service type:               SSH/Terminal/HTTP/HTTPS

  User group:                 system

  Bind attributes:

  Authorization attributes:

    Idle timeout:             10 minutes

    Work directory:           flash:

    User role list:           level-15, network-admin, network-operator

  Password control configurations:

    Password complexity:      username checking

Device management user yundiao_read:

  State:                      Active

  Service type:               SSH/Terminal

  User group:                 system

  Bind attributes:

  Authorization attributes:

    Idle timeout:             10 minutes

    Work directory:           flash:

    User role list:           level-1, network-operator

  Password control configurations:

    Password complexity:      username checking

yundiao_read  这个账户可以登录 
openstackadmin   这个账户登录不上 ，登录的日志如下
 EDEV/5/EDEV_DEBUG: -User=openstackadmin-OperateType=SSH-IPAddr=****   -UserModifi=**; User failed to login.

为什么有的账号可以登录有的账号登录不了？